As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCQ - MAJOR REPAIR - DURING C-19 CHECK A 1 INCH CRACK WAS FOUND IN LT RAM AIR HEAT EXCHANGER DUCT UPPER ATTACH ANGLE ON AFT OUTBOARD SIDE BS 665, LBL 64. MAINTENANCE REMOVED CRACKED LT RAM AIR HEAT EXCHANGER DUCT UPPER ATTACH ANGLE; FABRICATED A NEW REPLACEMENT ANGLE PER DWG 65-49573; INSTALLED REPAIR PART IAW B737-300 SRM 51-40-02.